Brake lining for a partial lining disk brake

ABSTRACT

The present invention discloses a brake lining which, in order to reduce and eliminate noises, has a sliding metal sheet in addition to the classical lining parts such as friction lining, lining support plate and damping plate. Further, the damping plate has bores which are filled with grease. The purpose of the grease is, primarily, to lubricate the surface directed to the sliding metal sheet and the damping plate so that both surfaces can slide on each other without friction.

The present invention relates to a brake lining for a spot-type discbrake which is provided with additional components to reduce andeliminate noises caused during braking.

In brake technology of spot-type disc brakes for automotive vehicles,brake linings are known which, beside the classical parts such as liningsupport member and friction lining, comprise additional components toprevent, reduce and eliminate noises which develop during braking in thecaliper due to occurring vibrations, tensions and friction. A thindamping plate which is made of plastics or a metal coated withcaoutchouc is applied to the back side of the lining support member. Afirst objective of the plastic plate is to absorb the vibrationsprovoked on the brake lining during braking and, thus, to prevent theirpropagation to the brake caliper and any resultant noises. A secondobjective is to attenuate noises which are produced by friction due to arelative movement between the brake lining and its abutment surfaces.The extensions of the brake lining shown in the art satisfy only in partthe desired requirements of complete noise elimination.

Therefore, an object of the present invention includes designing a brakelining so that full noise elimination is ensured.

According to the present invention, this object is achieved by thecharacterizing part of claim 1. Fitted to the back side of the liningsupport plate is a thin damping plate made of plastic material withbores which serve as grease-receiving pockets. The grease out of thepockets spreads over the damping plate and is covered with a slidingmetal sheet. Noises which are produced by vibrations of the liningsupport plate are uncoupled by the grease from the structure of thebrake caliper and thereby dampened directly and eliminated, and nottransmitted via the lining abutment surfaces to the structure of thebrake caliper on which they produce noises. Noises which are caused byfriction and produced due to the relative movement between the dampingplate and the lining abutment surfaces of the brake caliper are dampenedby way of the sliding metal sheet and the grease between the slidingmetal sheet and the damping plate. The rotational relative movementswhich occur in the moment of braking are shifted from the abutmentsurfaces of the brake caliper and the lining support member into theplane between the damping plate and the sliding metal sheet. The outsideof the sliding metal sheet adheres to the end surface of the brakepiston due to the frictional force, and the damping plate slides on theback side of the sliding metal sheet. The friction is greatly reduced oreliminated in full due to the grease which is spread out of the greasepockets inbetween the sliding metal sheet and the damping plate so thatvibrations or noises are not produced by friction between the slidingmetal sheet and the damping plate.

An embodiment of the present invention will be explained in detailhereinbelow, making reference to the accompanying drawing.

In the drawing,

FIG. 1 is a view of a brake lining for a spot-type disc brake,completely assembled, including damping plate and sliding metal sheet.

FIG. 2 is an exploded view of the brake lining for a spot-type discbrake including damping plate and sliding metal sheet.

The embodiment of FIG. 1 exhibits the completely assembled brake lining1 comprised of friction lining 2, lining support member 3, damping plate4, and sliding metal sheet 5. The damping plate 4 is cemented to theback side of the lining support member 3 and additionally fixed in itsposition by two rivets 16. At the top end of the damping plate 4, twopreformed 90-degree angles 12 are integrated which bear against theshoulder 17 of the lining support member 3 and, thus, support thedamping plate 4 downwardly in the Z direction. At the top end of thesliding metal sheet 5, two clips 6 which each have a resilient lip 8 atthe bottom edge are fitted for attachment to the attachment lug 13 ofthe lining 1. The clips 6 prevent detachment of the sliding metal sheet5 in the X direction and permit an assembly by slipping on in the Zdirection downwardly. In the assembly, the resilient lips 8 move intoabutment on the shoulder 14 of the attachment lug 13 and act as a stopfor the proper installation position. At its bottom end, the slidingmetal sheet 5 is provided with a punched-through projection 10 which issupported in the Z direction upwardly on the damping plate 4 and, thus,prevents detachment of the sliding metal sheet 5 in the Z direction.

FIG. 2 illustrates an exploded view of the individual parts of the brakelining 1, the lining support member 3 with friction lining 2, thedamping plate 4, and the sliding metal sheet 5. The damping plate 4includes two noses 15 at the top end of its abutment surface with theshoulder of the lining attachment lug 13. A depression 7 is indentedinto the sliding metal sheet 5 above the clips 6 on its abutment surfacedirected to the attachment lug 13. The depression 7 which urges thesliding metal sheet 5 away from the lining support member 3, along withthe clips 6 that draw the sliding metal sheet to the lining supportmember, produces a moment around the noses 15 of the damping plate thatact as fulcrum points, which moment presses the sliding metal sheet 5against the damping plate 4 and thus covers and closes the greasepockets 11.

As an alternative of the grease pockets 11 machined into the dampingplate, grease pockets 18 may be used which are configured as depressionsand are integrated in the sliding metal sheet 5. As shown in theembodiment of FIG. 2, the grease pockets 18 may be configured as acircular depression or, depending on the shape and space on the slidingmetal sheet, e.g. as circle segments, triangles, or in other shapes.

The moment directed to the brake lining 1 during braking is compensatedby a relative movement between the sliding metal sheet 5 and the dampingplate 4, with the result that tensions due to friction or torsions inthe caliper or in the lining are prevented and, thus, noises are notproduced. The moment introduced on the friction lining 2 is transmittedvia the lining support member 3 to the damping plate 4. The slidingmetal sheet 5 is maintained in its position on the abutment surface onthe frontal end of the brake piston by friction. The grease in thegrease pockets 11 of the damping plate is spread over the contactsurface between the sliding metal sheet 5 and the damping plate 4. Thisensures an almost frictionless sliding of the two components on eachother and prevents that noise develops due to friction. When the brakelining 1 is devoid of moments again after the braking operation, thesliding metal sheet 5 is reset to its initial position by the resilientmoment of the resilient lips 8 which press against the shoulders 14 ofthe attachment lug 13.

What is claimed is:
 1. A brake lining, comprising: a friction liningattached to a lining support member, a damping plate which includesgrease pockets containing grease, and a sliding metal sheet coveringsaid grease pockets, wherein the sliding metal sheet has adetachment-prevention arrangement with respect to an actuating directionof the brake lining in the form of two clips which backgrip anattachment lug of the lining support member, and in that apunched-through projection is positioned at the bottom end of thesliding metal sheet as a detachment-prevention arrangement of thesliding metal sheet vertically to the actuating direction, wherein thedamping plate has two nose-shaped extensions which bear against theattachment lug of the lining support member.
 2. A brake lining asclaimed in claim 1, wherein the sliding metal sheet at its top edgeabove the attachment lug for a retaining pin has a depression which isurged against the lining support member.
 3. A brake lining as claimed inclaim 1, wherein the sliding metal sheet is provided with ananti-rotation mechanism in the form of resilient lips on the bottom sideof the clips of the detachment-prevention arrangement.
 4. A brake liningas claimed in claim 1, wherein the sliding metal sheet is provided withgrease-receiving pockets.